The basic rule in Ayurveda is to exercise to 75 % of your capacity.  Don’t work out until you are exhausted and depleted.  Stop when you are still feeling good but can see that time coming.  This way, you will build up your stamina and strength.

Recommended exercise for balance:
Vata:  Low-impact – Yoga, Walking, Dancing
Pitta: Competitive or team sports, baseball, tennis, or Water sports, swimming
Kapha:  Stimulating, regular exercise, bodybuilding, running